A French court has found the only daughter of Saudi Arabia's King Salman guilty of complicity in violence for ordering her bodyguard to detain and strike a plumber for taking photos at the Saudi royal family's apartment in Paris.

The court gave her a 10-month suspended prison sentence and a 10,000-euro ($16,113) fine, tougher than the penalties prosecutors sought. The prosecution asked for a six-month suspended prison sentence and 5,000-euro fine.

The prosecution alleged the princess became enraged when she saw the plumber capturing her image at the royal residence near the luxury street of Champs-Elysees, fearing the pictures could be used to harm her as the Saudi monarch's daughter and the older half-sister of Crown Prince Mohammed bin Salman.

His sentence matched what the prosecution requested: an eight-month suspended jail term and a 5,000-euro fine.

Saida's lawyer said "there is no logic in the punishments" and he would decide on an appeal in coming days.

Ashraf Eid, the French-Egyptian plumber, told Paris police the bodyguard tied him up at the princess's bidding after he photographed a room so he could return furniture to its original layout once he finished his work.

His lawyer saluted his client, saying he has "courage" in bringing the case and said the verdict was proof of "everyone equal before the law".

"The princess noticed that her face was reflected in the bathroom and that she had been filmed. She called me a dog and called her bodyguard saying in Arabic, 'This one, take his phone. He filmed me,'" Mr Eid reported to police investigators.

Mr Eid said the bodyguard broke his phone and made him kiss the Saudi princess's feet while his hands were bound behind his back during the three-hour ordeal.